Iran's supreme leader Ayatollah Ali Khamenei on Saturday slammed what he described as bullying tactics a day after US President Donald Trump threatened military action.

"Some bully governments -- I really don't know of any more appropriate term for some foreign figures and leaders than the word bullying -- insist on negotiations," Khamenei told officials after Trump threatened military action if Iran refuses to engage in talks on its nuclear programme.

"Their negotiations are not aimed at solving problems, they aim at domination," Khamenei said.

On Friday, Trump said he had written to Iran's supreme leader, urging new talks on the country's nuclear programme but warning of possible military action if it refuses.

Foreign Minister Abbas Araghchi said Iran had yet to receive any letter from the US president by Saturday.

"We have heard of it (the........

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